Notebook with exchangeable leaves



Nov. 25, 1924 1,516,932

L. STAAB NOTEBOOK WITH EXCHANGEABLE LEAVES Filed May '7 1923 UNITED STATES PATENT OFFICE.

LUDWIG srAAE, or HOEEN, NEAR asin', GEEMANY.

NOTEBOOK WITH EXCHANGEABLE LEAVS.

vApplication led May 7, 1923. Serial No. 637,320.

To all whom t may concer/n:

Be it known that I, LUDWIG STAAB, a citizen of the German Reich, residing at Hofen, near J sny, Germany, have invented certain new and useful Improvements in Notebooks with Exchangeable Leaves (for which I have filed an application for patent in Germany on the 31st of March, 1922), of which the following is a specification.

Note books with loose leaves have become known already iny which a spiral spring is used for holding the leaves together. In

note books of this type the leaves were heldr either directly between the windings of the spiral spring or they were indirectly held by the spiral spring by means of intermediatepieces. According to the 4inventionthe spiral spring is screwed into holes stamped out -of the sheets near the edge at a distance apart from one another which corresponds with the distance between the threads of the screw, the spiral spring forming thus .at the same time the back of the book in the most The loose leaves a have erforations b near the -edge to be fastene and lfurther narrow strips: e in the four corners which are produced by incisions and designed to book or the insertion of other sheets, the spiral spring d being screwed out of the per-4 foratlons b, to be screwed in again after the sheets have been arranged.

This` fastening together may be used also for other materialas for instance for drawings or the like.

I claimp:- 1 v A note book with exchangeable leaves comprising in combination loose sheets each having perforations near one edge,'said perforations being spaced from one another at a uniform distance, and a spiral spring the distance between the turns' of which corresponds to the distance between the perforations, said spiral spring being screwed into said perforations of the super-posed' sheets.

In testimony whereof I aix my signature in presence of two witnesses.

LUDWIG STAAB. Witnesses:

. ALEXANDER DE Lorna, ALEXIS PHILIPPOFF. 

